how to use integer variable as subscript in Django template

Question

I have a for loop in a Django template:

{% for i in no_of_lift_series_range %}
    {{ workout.lifts.series.i.activity_name }}
{% endfor %}

where this fails to output anything. The problem lies in the use of i. I know this, because this:

{% for i in no_of_lift_series_range %}
    {{ workout.lifts.series.0.activity_name }}
{% endfor %}

outputs what it is supposed to output. Why can't I use i in the way I want and how do I make this work?

@DanielRoseman because I need i for other purposes in the loop — Sahand
– Sahand, Commented Jan 11, 2018 at 18:37
To update, forloop.counter0 cannot be used since I need i in order to do numeric index acces with it, which doesn't seem possible in django templates — Sahand
– Sahand, Commented Jan 12, 2018 at 9:06
@Sandi you have to think about "i" as a String, as a literal. When you say {{ object.0 }} Django tries to do: getattr(object, "0") and if it fails it tries to do this: object[int("0")]. But your variable "i" will be interpreted as getattr(object, "i"), it'll look for that name, not it's content. — wm3ndez
– wm3ndez, Commented Jan 13, 2018 at 17:42

Ivan · Accepted Answer · 2018-01-11 19:19:07Z

4

I would create custom template filter to get the list item by index:

@register.filter
def get_by_index(mylist, index):
    return mylist[index]

You could use it like this:

{% for i in no_of_lift_series_range %}
    {% with item=workout.lifts.series|get_by_index:i %}
        {{ item.activity_name }}
    {% endwith %}
{% endfor %}

answered Jan 11, 2018 at 19:19

Ivan

2,6751 gold badge14 silver badges24 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Arnoux · Accepted Answer · 2018-01-11 19:14:21Z

-2

Your logic seems a bit off. Perhaps you should be doing something like this instead:

{% for activity in workout.lifts.series %}
    {% with forloop.counter as count %}
        {{ count }} - {{ activity.activity_name }}
    {% endwith %}
{% endfor  %}

answered Jan 11, 2018 at 19:14

Arnoux

2362 silver badges9 bronze badges

Collectives™ on Stack Overflow

how to use integer variable as subscript in Django template

2 Answers 2

Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related